NVG Maintenance Tool Set (Gen 2)The Opfor Night Solutions Maintenance Tool Set is recommended for all builders and hobbyists to own. Whether its cleaning your device, performing basic maintenance, or building a device from the ground up, this tool set has you covered. Our second generation set adds an infinity stop spanner wrench. While it is not necessary for most devices, it can be helpful for specific devices where the infinity stop is overly tight from the factory such as on PVS